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【多选题】
关于计算机网络的讨论中，下列哪个观点是不正确的?（ ）A.
组建计算机网络的目的是实现局域网的互联
B.
联入网络的所有计算机都必须使用同样的操作系统
C.
网络必须采用一个具有全局资源调度能力的分布操作系统
D.
互联的计算机是分布在不同地理位置的多台独立的自治计算机系统
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【单选题】As I don't know _____ to take up Miss Rose's course because of her wedding leave, I have to ask her students about it . [ ]
A.
how
B.
what
C.
where
D.
whether
【单选题】I ____ that we would be able to leave soon, but it’s beginning to look difficult.
A.
hoped
B.
have hoped
C.
was hoping
D.
had hoped
【单选题】I ______ that we would be able to leave tomorrow, but it's beginning to look difficult.
A.
hope
B.
hoped
C.
have hoped
D.
had hoped
【单选题】－I my keys in the room yesterday. I had to get in the window. －It’s dangerous to do that.
A.
leave, from
B.
left, through
C.
forget, from
D.
forgot, through
【单选题】—Excuse me, visiting hours are over．It' s time for you to leave． —I' m sorry, I didn't know the time or I ______ earlier．
A.
will leave
B.
would leave
C.
had left
D.
would have left
【单选题】I ______ that we would be able to leave tomorrow, but it's beginning to look difficult.
A.
had hoped
B.
has hoped
C.
hope
D.
hoped
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